Final answer:
The precise "phrase that pays" from the Desmos lesson is not provided, but it emphasizes understanding equations as meaningful sentences, not just algorithms.
Step-by-step explanation:
The "phrase that pays" from the Unit 6 Practice Test Desmos Lesson, as noted on the page titled 10.3: The Phrase, is not provided verbatim in the available reference material. However, based on the context provided, a concept that echoes the sentiment of the text is the importance of treating equations as sentences that express important concepts in precise ways, rather than as mere algorithms to memorize and plug in while solving problems. Therefore, the phrase likely encapsulates the idea of understanding the conceptual meaning behind equations in mathematics.